Definition of voussoir in English:

noun

This tomb is notable because it introduced for the first time in India the principle of the true arch with radiating voussoirs.

It has to be remembered that even repeated patterns round a window required different models for each side, as well as for the voussoirs, keystone, and stop-ends, each of which had to be specially drawn.

At the underside of the sixth floor, the atrium narrows to a small opening encircled by polished granite voussoirs.